The project involves the modernisation of three weirs located on the Oder: Tight, Well, Groszowice to adapt the Oder to the third class of the waterway. The investment will contribute to improving the operating conditions of the facilities in terms of their failure-freeness, and thus the efficiency of controlling the process of passing water through the analysed weirs, which, in the current technical condition, present many operational problems resulting from frequent failures, which result in the impossibility of properly manoeuvring closures and maintaining an appropriate level of navigable water. The reconstruction of the facilities also aims at improving the condition of equipment and technological equipment in terms of their operational, control and communication usability, protection against theft and vandalism, as well as the opening of a river section for so-called two-environment fish, while ensuring proper parameters and technical condition of the facilities.